Development and Application of the Downhole Drilling String Shock-Absorption and Hydraulic Supercharging Device

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td class="align_left">Speed comparison</td><td class="align_center">Drilling method</td><td class="align_center">Well depth/m</td><td class="align_center">Lithology</td><td class="align_center">Speed/m/h</td><td class="align_center">Speedup comparison/%</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left">Test interval</td><td class="align_center">PDC + downhole shock-absorption and hydraulic supercharging device</td><td class="align_center">1794–1848</td><td class="align_center" rowspan="2">Silty mudstone, brown mudstone</td><td class="align_center"><b>3.84</b></td><td class="align_center"><b>+12%</b></td></tr><tr><td class="align_left">Comparison interval</td><td class="align_center">PDC + Power-V</td><td class="align_center">1489–1673</td><td class="align_center"><b>3.43</b></td><td class="align_center"> </td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Comparison of mechanical drilling speeds into siltstone and mudstone in adjacent well intervals speeds into siltstone and mudstone.

Shock and Vibration

tab2

Table 2

Table 2: Development and Application of the Downhole Drilling String Shock-Absorption and Hydraulic Supercharging Device 